public class 小练习 {
    public static void main(String[] args) {
        int level = 13;
        for(int i = 0;i < level;i++ ){
            for(int j = 0;j < (level - 1) - i;j++){
                System.out.print(" ");
            }
            for (int n = 0; n < i * 2 + 1; n++) {
                System.out.print("*");
            }
            System.out.print("\n");
        }
    }
}
